Ok, since I feel like being a phallus....
The sign that says "20 items or less" MUST BE OBEYED!!!! according to some here....do you also consider this sign the same way?
This sign, just like the "20 items or less" is only a guideline. If you carry your gun into WM and they see it, they can ask you to leave. If you have 26 items in the "20 or less" line, they can ask you to move. If you refuse, they can then ask you to leave.
I will follow the "20 items or less" sign because I can possibly inconvenience others who are following the rules. I have chosen on occasion to ignore the "No Guns" signs because that inconveniences no one. However, if someone saw my gun, I would not hesitate to leave as I understand it's against their rules.